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For auto accompaniment there are two that I can think of:1) "one Man Band" I think this is the most like the arraigner keyboardsthey have several versions at http://www.1manband.nl/ It can play Yamaha style files2) "Band in a Box" is better known and has been around "forever" http://www.pgmusic.com/

Both of the above are much more powerful then any of those simple patterns built into the keyboard.

This is what I can think of and I'm only just getting started. I can think of more titles but I don't know what most of them can do. Pick up the lastest Sweetwater, Sam Ask or Guitar Canter catalog and there are pages and pages of software. I don't know who'd ever have time to evaluate it all